BRACHIOPODA. 211 



bratulifbnn. In the latter species no trace of the cardinal area remains on 

 either valve on account of the encroachment of the delthjriura. 



In these shells there is occasionally developed a tendency to close the delthy- 

 riuni of the brachial valve. This is never carried very far, but in some species 

 where the cardinal process attains a great size, as in 0. Pendope, 0. musculosa, 

 and others, it more than fills the delthyrial cavity, pressing upward the thinner, 

 unsupported portion of the cardinal area, where it covers the dental sockets. 



SCHIZOPHORIA, King. 1850. 

 XII. Group of Orthis resupinata, Martin. 



CONCHYLIOLITHOS ANOMITES RESUPINATA, Martin. 



PLATE VI, FIGS. 17, IS, ii-31 ; AM) I'LATK VIA, FIGS. 23-32. 



1809. ConvhyliolitlnLS aiiomites. Martin. Peti-ef. Dei-b., tab. xlix, figs. 13, 14. "" 



1813. Aiiomia, Schlotueim. Min. Tasehenbuch, vol. viii, pi. 1, fig. 6. 



1820. Teiebratalites, Schlotueim. Die Petrefactenknnde auf ihi-em jetzigen Standiiunkte, pp. 253, 254. 



1822. Terehratula, Sowbrby. Mineral Conohology, vol. iv, p. 25. 



1822. Uystcrolitlies, Schlotheim. PetiefactenkiiiKie, p. 247. 



1836. Spirifera, Phillips. Geology of Yorkshire, vol. ii, pi. xi, (ig. 12. 



1840. Spirifera, vo.n Buch. Mem. Soc. Geol. lie France, vol. iv, pi. 10, (ig. 32. 



1842. Orthis, Vandxem. Geology of N. Y. ; Kept. Third District, pp. 163, 164. 



1843. Orthis, Hall. Geology of N. Y. ; Kept. Fourth Dist.. p. 215. 



1843. Orthin, DE KoNlNCK. Description des Aniinaux Fossiles de Belgique, pi. xiii, fig. 9. 



1844. Orthis, McCoy. Syn. Carb. Fossils Ireland, pi. xx, fig. 20. 



1850. Schizophoria, King. Monogr. Permian Fossils of England, p. 106. 



-1851. HysteroUthes, Qdenstedt. Handbuch der Petrefact., p. 484. 



1857. OrthU, Hall. Tenth Rep. N. Y. State Cab. Nat. Hist., pp. 45, 110. 



1857. Orthis. Cox. Owen's Geological Survey Kentucky, vol. iii, p. 570. 



18.i8. Orthis, Hall. Kept. Geol. Surv. Iowa, vol. i, pt. 2, pp. 488, 489, 597. 



1859. Orth'is, Hall. Pala>ontology of N. Y., vol. 3, p. 176. 



1859. Ortk'is, BiLLi.\(;.s. Hind's Rep. Expl. A.ssiniboine, S.askatchewan, etc., p. 193. 



1861. Orthis, Davidson. British Carb. Brachiopoda, j). 130. 



1862. Orthis, A. Winchbll. Proc. Acad. Nat. Sci. Phil., vol. xiv, p. 410. 



1867. Orthis, Hall. PaUeontology of N. Y., vol. iv, pp. 43, 55, 58, 59, 60. 



1868. Orthis, Meek. Transactions Chicago Acad. Sci., vol. i, pp. 88, 90. 



1868. Orthis, Meek and Worthen. Geological Survey of Illinois, vol. iii, pp. 423, 424. 



1874. Orthis, Dekey. Bull. Cornell Univei'sity, vol. i, p. 63. 



1877. Orthis, Hall and Whitfield. U. S. Geol. Expl. 40th Par., vol. iv, p. 265. 



1881. Orthis, White. Second Ann. Rept. Bureau Stat, and Geol. Indiana, p. 133. 



1882. Oithis, Whitfield. Geology of Wisconsin, vol iv, pt. 3, Palaeontology, p. 326. 

 18S3. [Schizophoria,] Hall. Ri>])t. N. Y. State Geologist for 1882. pi. xxxvi. 



1883. Schizophoria, Hall. Thiity-sixth Rept. N. Y. State Mus. Nat. Hist., p. 75. 



1884. Orthis, Wai.cott. Palseontology Eureka District, pp. 114. 115. 

 1889. Orthis, Nettelroth. Kentucky Fossil Shells, p. 43. 



